Sweet cherry

Availability and types of the cherry (sweet)

Sweet cherry is a popular fruit to enjoy fresh in summer. It originally comes from regions around the Black Sea and Anatolia, but was introduced long ago to many other countries. Today sweet cherries grow in warm regions with cool winters, because the trees need a certain number of cold days to flower well in spring. These cold days are sometimes called chill hours — it simply means the trees must experience some days of winter cold so they will later produce many fruits.

Important growing regions include:

Sweet cherries come in many different varieties and shapes. Some are dark red to almost black, others are light red or even yellow with a red blush. Here are some well-known varieties you might have seen:

Besides fresh cherries there are also various processed forms available year-round:

If you want to buy fresh cherries, this simple tip helps: choose fruits that are firm and shiny and still have a green stem — that means they are fresh. Don’t worry if you see cherries in winter: they often come from Southern Hemisphere countries or are frozen or jarred. This way you can enjoy cherries almost year-round, even though the natural peak season is summer.

Sweet cherry (botanically usually Prunus avium) is a stone fruit valued worldwide both as fresh fruit and in processed products. The fruit is characterized by a juicy flesh surrounding a central hard pit (stone) and varies in size, color and sweetness depending on the variety. Sweet cherries differ from sour cherries both in organoleptic composition and in dominant phytochemicals.

Chemical composition and main constituents: sweet cherries consist mainly of water (about 80–83 %), followed by carbohydrates (approx. 10–16 %), mainly simple sugars such as fructose, glucose and sucrose. The content of organic acids is moderate; the dominant compound is malic acid (malate). Dietary fiber (mainly pectin) is present in smaller amounts. Fat and protein content is minimal.

Nutritional values (approx. per 100 g of fruit):

Phytochemicals determine color and health-related properties. Anthocyanins (especially cyanidin‑3‑glucoside and related glycosides) are responsible for red to purple hues. Other phenolic compounds include flavonoids, hydroxycinnamates and proanthocyanidins. These substances have antioxidant and inflammation-modulating properties in vitro and in some clinical studies.

Biochemical aspects and postharvest physiology: sweet cherries show high metabolic activity after harvest. The fruit has a relatively short shelf life, which can be extended by cold storage, controlled atmosphere (reduced O2, elevated CO2) and rapid cooling. The enzyme polyphenol oxidase causes browning when tissues are damaged. Respiration and transpiration lead to moisture loss and quality decline.

Processing and technological applications: sweet cherries are eaten fresh or processed into juice, canned products, jams, dried fruit, concentrates and alcoholic products. Industrial processing uses draining, pitting (e.g. hydraulic pitters), pasteurization and concentration. Anthocyanins are also used as natural colorants for foods and cosmetic applications. When pitting, it should be noted that cherry pits can contain amygdalin, a cyanogenic glycoside that can be toxic if crushed and ingested in large amounts.

Health aspects: the content of antioxidants and polyphenols suggests that regular moderate consumption may have positive effects on markers of oxidative stress, inflammatory mediators and possibly on recovery after intense physical exercise. Some studies indicate a possible effect on gout and improvement of sleep quality, although many findings have been investigated mainly for sour cherries. Because of the sugar content, people with diabetes should monitor portion sizes.

Safety and storage instructions: fresh sweet cherries should be stored cool (0–4 °C) and consumed within a few days. Freezing significantly extends shelf life. Due to the pit, cherries can be a choking hazard for small children; pits should not be eaten or crushed.

Overall, the sweet cherry is a low-energy, water-rich fruit with characteristic polyphenols and a pronounced aroma profile, which can be used both gastronomically and nutritionally in many ways.